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The stress and modal analysis in parametric adaptive CAD programs
Sedláček, Petr ; Ondrůšek, Čestmír (referee) ; Kuchyňková, Hana (advisor)
This thesis is focusing on the use of the finite element method (FEM) in program environment of Autodesk Inventor Professional (AIP) 2010. For the analysis of the components or assemblies with FEM serves the Strength analysis module of the AIP 2010, whose environment and functions are detailed in this thesis. At the conclusion practical examples of modal and static analysis on the synchronous generator rotor model are demonstrated including a brief evaluation of the results.
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Time domain edge finite elements
Cigánek, Jan ; Motl, Milan (referee) ; Raida, Zbyněk (advisor)
Diplomová práce se zabývá metodou hybridních (hranových a uzlových) konečných prvků ve frekvenční i časové oblasti. Tato metoda je použita pro analýzu vlnovodu parallel-plate, v kterém jsou umístěny dvě dielektrické vrstvy. Jako ukončení vlnovodu je implementována dokonale přizpůsobená vrstva označována PML. Projekt řeší možný výběr PML vrstvy v časové oblasti. Metoda je programována v programu MATLAB a výsledky jsou porovnány s programem COMSOL Multiphysics.
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Thermal conductive plate with controlled thermal field
Masár, Pavol ; Král, Bohumil (referee) ; Steinbauer, Miloslav (advisor)
This work deals with design of thermal source of panel shape for scientific biological application. Panel has adjustable surface temperature and thermal gradient. The first part of this work concern with design and numerical modeling of the thermal system, application of materials and arrangement of thermal and cooling devices – Peltier elements. Second part of this work is about construction of the panel and experimental measurement.
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Thermal analysis of plastic part using finite element method
Zemanová, Lucie ; Nečas, David (referee) ; Zatočilová, Aneta (advisor)
The bachelor thesis deals with the thermal deformation of a plastic component after thermal loading and ways of processing digital data for a thermal analysis. There is optical digitizing outlined, since input data were obtained this way, and methods of subsequent processing for the thermal analysis. The analysis is carried out by the finite element method using ANSYS Workbench software. The finite element method is described. The work builds on measuring performed by photogrammetry, the aim is to compare applicability finite element method and photogrammetry for measuring deformation.
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Numerical modeling of crack propagation under conditions of LEFM
Mikula, Jakub ; Hutař, Pavel (referee) ; Ševčík, Martin (advisor)
The presented bachelor’s thesis deals with numerical modeling of crack propagation in general planar body. A user macro was created in APDL programming language for estimation of crack propagation direction and collection of data. Macro allows selection one of the four criteria intended to estimate the direction of the crack and the subsequent listing of the data into a text document. The calculation is based on the finite element method (FEM) using a commercial system ANSYS. The conditions of linear elastic fracture mechanics (LEFM) are expected during the calculation. The first part of this thesis describes the basic concepts of LEFM, including a description of mentioned criteria. The second part is devoted to the created macro. It also describes the algorithm and the necessary conditions for correct processing of data. A comparison with available published data or with experimental data gives a summary of the accuracy and utilization of created macro. In conclusion, the example of estimation of the residual life by different criteria is shown, as its other application.
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Analysis of concrete pipe using fracture-mechanical models
Bejček, Michal ; Šimonová, Hana (referee) ; Řoutil, Ladislav (advisor)
This bachelor thesis is focused on plain concrete pipe analysis in consideration of design problems. The introduction describes concrete pipe including imposed standards. The next part contains a summary of the calculation methods used nowadays. The thesis explores whether the fracture-mechanical calculation is sufficiently apt and therefore can be applied for the pipeline design. A number of pipe profile models was constructed and analysed for this purpose. The calculation based on the finite element method with applied crack band model was executed by software ATENA 2D. The crushing strength, which is compared to real tests data, is determined in models with altered input figures. The thesis also studies the negative effects on carrying capacity including material degradation.
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Finite element solution of the nonlinear 2DOFs dynamic system under random Gaussian excitation using the Fokker-Planck equation
Král, Radomil ; Náprstek, Jiří
Papers published until now are dealing with single degree of freedom (SDOF) systems. So the respective FP equation includes two independent space variables only (x1, x2). Nevertheless stepping over this limit and entering into a true multi-dimensionality a number of specific problems must be overcome. While in usual FEM practice the number of space variables is two or three, investigating FP equation, so 2n independent space variables emerges. It means for instance 12 space variables when random motion of a rigid body in space with six degrees of freedom is studied. Many requirements should be respected which are out of a conventional practice of Finite Element employment.
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FEM simulation of thermal differences in semi finished glass pieces during the cooling
Havelková, Martina ; Schovánek, Petr
Semi finished glass pieces are moulded in the furnace to template forms not only to fit their shape but also to reduce internal stresses. Thermal differences are unwanted and have to be minimized in the cooling procedure of the glass pieces. Simulations of various types and sizes of shaping forms and complex model cooling were accomplished. The aim of these simulations was to optimise geometric parameters, clamping conditions and material of the form, so that thermal differences at glass are minimized during the cooling.
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Numerical modelling of the glass shaping forms cooling
Havelková, Martina ; Schovánek, Petr
The purpose of heat treatment of semi finished glass pieces in shaping forms is not only to fit their shape but also to reduce internal stresses. Thermal differences are unwanted and have to be eliminated in the cooling procedure of the glass pieces. Simulations of different types and sizes of shaping forms and complex model cooling were accomplished. The aim of these simulations was to optimise geometrical parameters, clamping conditions and material of the form, so that thermal differences at glass or glass – form interface are minimized during the cooling.
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